Writing instrument



FIG. 1 is a right side elevational view of a writing instrument showing my new design;

FIG. 2 is a front elevational view;

FIG. 3 is a left side elevational view;

FIG. 4 is a rear elevational view;

FIG. 5 is a left side elevational view in an exploded condition;

FIG. 6 is a front elevational view with a cap member in a stored position;

FIG. 7 is a top plan view;

FIG. 8 is a bottom plan view;

FIG. 9 is a left side elevational view of a second embodiment of my design shown in an exploded condition; and

FIG. 10 is a front elevational view of FIG. 9 with the cap member in a stored position. 

The ornamental design for a writing instrument, as shown and described. 